Answer :

AL2006

The area of every circle is                (pi) x (radius)²

and the radius of every circle is      (1/2) x (diameter) .

This is only useful if Susan b Anthony's chin was circular.


Panoyin
A = πr²
A = 3.14(5)²
A = 3.14(25)
A = 78.53981634mm²

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